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Appl. Sci. 2018, 8(9), 1583; https://doi.org/10.3390/app8091583

Planning Lung Radiotherapy Incorporating Motion Freeze PET/CT Imaging

1
Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 40402, Taiwan
2
Department of Medical Imaging, Chang Bing Show Chwan Memorial Hospital, Changhua 50544, Taiwan
3
Department of Radiation Oncology, Moffitt Cancer Center, Tampa, FL 33612, USA
4
Department of Bioinformatics and Medical Engineering, Asia University, Taichung 41354, Taiwan
5
AI Center for Medical Diagnosis, China Medical University Hospital, Taichung 40402, Taiwan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 30 July 2018 / Revised: 4 September 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Advanced Intelligent Imaging Technology)
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Abstract

Motion Freeze (MF), which integrates 100% of the signal of each respiratory phase in four-dimensional positron emission tomography (4D-PET) images and creates the MF-PET, is capable of eliminate the influences induced by respiratory motion and dispersing from three-dimensional PET (3D-PET) and 4D-PET images. In this study, the effectiveness of respiratory gated radiotherapy applying MF-PET (MF-Plan) in lung cancer patient was investigated and compared with three-dimensional intensity modulated radiotherapy (3D-Plan) and routine respiratory gated radiotherapy (4D-Plan) on the impact of target volume and dosimetry. Thirteen lung cancer patients were enrolled. The internal target volumes were generated with 40% of maximum standardized uptake value. The 3D-Plan, 4D-Plan, and MF-Plan were created for each patient to study the radiation to the targets and organs at risk. MF-Plans were associated with significant reductions in lung, heart, and spinal cord doses. The median reductions in lung V20, lung mean, heart mean doses, and spinal cord maximum dose compared with 3D-Plans were improved. When compared with 4D-Plans, the median reductions in lung V20, lung mean dose, heart mean dose, and spinal cord maximum dose were improved. Our results indicate that the MF-Plan may improve critical organ sparing in the lung, heart, and spinal cord, while maintaining high target coverage. View Full-Text
Keywords: lung cancer; 4D PET/CT; respiratory gated radiotherapy; motion freeze lung cancer; 4D PET/CT; respiratory gated radiotherapy; motion freeze
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yang, S.-N.; Chiang, W.-C.; Chou, K.-T.; Zhang, G.; Huang, T.-C. Planning Lung Radiotherapy Incorporating Motion Freeze PET/CT Imaging. Appl. Sci. 2018, 8, 1583.

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